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My question pertains to 120V VAVs and HVAC terminal units installed above a non-structural lay-in ceiling. My local AHJ requires that the face of the VAV enclosure cover align with the edge of an opening in the ceiling grid and uses 110.26(A)(3) to determine the "Height of Working Space" for these units measured from the top of the ceiling grid and extending out to the depth of the working space as required by 110.26(A)(1). This creates an "access tile" so to speak, with the VAV enclosure cover aligned with one edge of the opening in the ceiling grid. 110.26(A)(4)(4) seems to override this definition of working space height and the requirement to align the VAV enclosure cover with the ceiling grid. The specific issue that we have run into is when ceiling-supported equipment (i.e. lay-in fixtures, PA speakers, etc) extends above the ceiling grid (any amount) opposite the VAV, the AHJ fails the inspection. I would like a second opinion. Is appropriate to apply 110.26(A)(3) and ignore 110.26(A)(4)(4) in these instances? If I am misinterpreting the code as it pertains to this situation... I would like to be enlightened.
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